(From left) Roxie of "Lady Day at Emerson’s Bar & Grill" and "Of Mice and Men's" Violet are among the cutest canines on stage.Richard Phibbs (right)

Theater has gone to the dogs — and they’re proving themselves the highlights of the season. In fact, no other member of off-Broadway’s newly revived “The Threepenny Opera” received warmer reviews than Romeo, the cross-dressing bulldog. Here are a quartet of canine up-and-comers — all of them rescue dogs — and where to find them.